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Introduction Selective IgA deficiency (IgAD; serum IgA concentration of <0.07 g/l) is the most common primary immunodeficiency in Caucasians with an estimated prevalence of 1/600. The frequency of the extended major histocompatibility complex haplotype HLA A1, B8, DR3, DQ2 (the “8.1” haplotype) is increased among patients with IgAD. Materials and Methods We carried out a direct measurement of...
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